\chapter{Standard EnergyPlus Units}\label{standard-energyplus-units}

EnergyPlus has adopted the standard SI units for input and output.

ASCII with no spaces is used for abbreviations. Note that exponents appear without any indication of exponentiation: i.e., kg/m3 not kg/m\^{}3 or kg/m**3. Also note the use of dashes. We have W/m2-K not W/m2*K or W/(m2*K).

At the end we note the ``problem'' variables -- the inputs that have non-standard units. Inputs using these units will have to be changed and the code checked to see how the quantities are used internally.

% table 10
\begin{longtable}[c]{p{1.59in}p{2.9in}p{1.5in}}
\caption{Standard EnergyPlus Units \label{table:standard-energyplus-units}} \tabularnewline
\toprule
Quantity & unit & abbreviation \tabularnewline
\midrule
\endfirsthead

\caption[]{Standard EnergyPlus Units} \tabularnewline
\toprule
Quantity & unit & abbreviation \tabularnewline
\midrule
\endhead

angular degrees & degree & deg \tabularnewline
Length & meter & m \tabularnewline
Area & square meter & m2 \tabularnewline
Volume & cubic meter & m3 \tabularnewline
Time & seconds & s \tabularnewline
frequency & Hertz & Hz \tabularnewline
temperature & Celsius & C \tabularnewline
absolute temperature & Kelvin & K \tabularnewline
temperature difference & Celsius & deltaC \tabularnewline
Speed & meters per second & m/s \tabularnewline
energy (or work) & Joules & J \tabularnewline
Power & Watts & W \tabularnewline
Mass & kilograms & kg \tabularnewline
Force & Newton & N \tabularnewline
mass flow & kilograms per second & kg/s \tabularnewline
volume flow & cubic meters per second & m3/s \tabularnewline
Pressure & Pascals & Pa \tabularnewline
pressure difference & Pascals & Pa \tabularnewline
specific enthalpy & Joules per kilogram & J/kg \tabularnewline
Density & kilograms per cubic meter & kg/m3 \tabularnewline
heat flux & watts per square meter & W/m2 \tabularnewline
specific heat & ------------------------------------------------------------------------ & J/kg-K \tabularnewline
conductivity & ------------------------------------------------------------------------ & W/m-K \tabularnewline
Diffusivity & ------------------------------------------------------------------------ & m2/s \tabularnewline
heat transfer coefficient & ------------------------------------------------------------------------ & W/m2-K \tabularnewline
R-value & ------------------------------------------------------------------------ & m2-K/W \tabularnewline
heating or cooling capacity & Watts & W \tabularnewline
electric potential & volts & V \tabularnewline
electric current & Amperes & A \tabularnewline
illuminace & lux & lx \tabularnewline
luminous flux & lumen & lm \tabularnewline
luminous intensity & candelas & cd \tabularnewline
luminance & candelas per square meter & cd/m2 \tabularnewline
vapor diffusivity & m2/s & ~ \tabularnewline
Viscosity & ------------------------------------------------------------------------ & kg/m-s \tabularnewline
Dynamic Viscosity & ------------------------------------------------------------------------ & N-s/m2 \tabularnewline
Porosity & ------------------------------------------------------------------------ & m3/m3 \tabularnewline
thermal gradient coeff for moisture capacity & ------------------------------------------------------------------------ & kg/kg-K \tabularnewline
isothermal moisture capacity & ------------------------------------------------------------------------ & m3/kg \tabularnewline
\bottomrule
\end{longtable}
